When replying email in rich text format, Gmail behaves like Outlook and encourages me to write the reply at the top. The problem is I want to write my reply between the paragraphs of the previous email text.

If I choose plain text, Gmail adds ">" on the left of each line, which is good, but the quoted text is kept as a single very long line of text. Gmail doesn't break the line into several lines after 70/80 characters.

Is there an option or plugin or tool to customize how Gmail quote previous email?